To convert an OST file to MBOX format, you must first export your OST data as a PST file using Outlook. Afterward, you can utilize a specialized tool like the SysInfo OST to PST Converter to transform the PST file into MBOX format. Since Outlook does not support a direct "manual" conversion from OST to MBOX, third-party software is essential for completing the final step of the process.

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